National Institutes of Health. For those interested in work for the federal government. Has a section for scientific jobs and research training opportunities for those with a background in the sciences.

The National Science Foundation . An independent federal agency created by Congress in 1950 “to promote the progress of science; to advance the national health, prosperity, and welfare…”. Multiple job listings in the sciences.

Roll Call Jobs. A job source for all kinds of jobs working in Washington DC , including those in science, engineering and technology.